Malicious PDF — malware analysis report

Static analysis result for SHA-256 48951fc8db750f2c…

MALICIOUS

PDF

105.6 KB Created: 2021-07-02 22:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 900fa5a206b7a32d743c4e76cd6b2bc8 SHA-1: 5de6f3432f3dc591434439ef5e4b3834dc039cef SHA-256: 48951fc8db750f2c02f3090477430671eec0280d73525343b73aa49d0b3c877e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The presence of a 'download button' heuristic further supports this, indicating a lure for users to click and download. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9654

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160906e941d63b---6408095517.pdf In PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/vozifegajuwufidoluselutuk.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160764bb4c91a4---vasozotu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c79561f98---xomebidom.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d3244a45d---lebirigaraxupiwodevem.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c722cbcc0e0155a3bce76381589f8e91/ximuwavonutokek.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d70211830e735c9b0a6096debc4a8def/67350819014.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7d5e4b6f9d5e094928f4f3eaf64708ad/76032223773.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/nolitobalofunisi.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089afc1ace3f---31897458452.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b7bf1295acba211d4cdb39538c23ceb5/lagedaposusalefame.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/bepibupub.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c84f7c0c618---62389083301.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3dc7252dd6a13c9c08248440b96b0c9a/26379925788.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098581b82569---fewesufavuvona.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2534d51eb5ce078e368740012c4d7275/biferadu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/jna9anakrv7orhuk7foaf8l342/45995300055.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/menopi.pdfIn PDF document text
    • http://novichiha.ru/pic/file/16806805240.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qno183mpqhnug71faosak6car5/bivuwefuduwegizumu.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0924b6d0---5721257431.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/tvpaaa8oqqni60naldjtf1cdp6/75993503052.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/novavawupatofiza.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/fe06ff92dd79539472a4f10cf47c6ca5/74064255710.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98c4784ab---dixeku.pdfIn PDF document text
    • https://mgc.to/sites//web/upload/files/59839944621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nfs+most+wanted+pc+system+requirementsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 11160 bytes
SHA-256: c47ef660733699a0f33a9a164d078184a946faab3d219e11cb4dafd33680ec6e
font_01_sfnt_off0001393a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393A 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off00014e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16691 18688 bytes
SHA-256: f686cea612eea2a72813103968c96f81f13a3ed8400eb8cddaba8963b1017a27

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